mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
#ifndef SPROUT_ITERATOR_PREV_HPP
|
|
#define SPROUT_ITERATOR_PREV_HPP
|
|
|
|
#include <iterator>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/adl/not_found.hpp>
|
|
|
|
namespace sprout_adl {
|
|
sprout::not_found_via_adl iterator_prev(...);
|
|
} // namespace sprout_adl
|
|
|
|
namespace sprout {
|
|
namespace iterator_detail {
|
|
template<typename RandomAccessIterator>
|
|
inline SPROUT_CONSTEXPR typename std::enable_if<
|
|
std::is_literal_type<RandomAccessIterator>::value,
|
|
RandomAccessIterator
|
|
>::type prev_impl(
|
|
RandomAccessIterator const& it,
|
|
std::random_access_iterator_tag*
|
|
)
|
|
{
|
|
return it - 1;
|
|
}
|
|
template<typename BidirectionalIterator>
|
|
inline SPROUT_CONSTEXPR BidirectionalIterator prev_impl(
|
|
BidirectionalIterator const& it,
|
|
void*
|
|
)
|
|
{
|
|
return std::prev(it);
|
|
}
|
|
|
|
template<typename RandomAccessIterator>
|
|
inline SPROUT_CONSTEXPR typename std::enable_if<
|
|
std::is_literal_type<RandomAccessIterator>::value,
|
|
RandomAccessIterator
|
|
>::type prev_impl(
|
|
RandomAccessIterator const& it,
|
|
typename std::iterator_traits<RandomAccessIterator>::difference_type n,
|
|
std::random_access_iterator_tag*
|
|
)
|
|
{
|
|
return it - n;
|
|
}
|
|
template<typename BidirectionalIterator>
|
|
inline SPROUT_CONSTEXPR BidirectionalIterator prev_impl(
|
|
BidirectionalIterator const& it,
|
|
typename std::iterator_traits<BidirectionalIterator>::difference_type n,
|
|
void*
|
|
)
|
|
{
|
|
return std::prev(it, n);
|
|
}
|
|
|
|
template<typename BidirectionalIterator>
|
|
inline SPROUT_CONSTEXPR BidirectionalIterator
|
|
iterator_prev(BidirectionalIterator const& it) {
|
|
typedef typename std::iterator_traits<BidirectionalIterator>::iterator_category* category;
|
|
return sprout::iterator_detail::prev_impl(it, category());
|
|
}
|
|
template<typename BidirectionalIterator>
|
|
inline SPROUT_CONSTEXPR BidirectionalIterator
|
|
iterator_prev(BidirectionalIterator const& it, typename std::iterator_traits<BidirectionalIterator>::difference_type n) {
|
|
typedef typename std::iterator_traits<BidirectionalIterator>::iterator_category* category;
|
|
return sprout::iterator_detail::prev_impl(it, n, category());
|
|
}
|
|
} // namespace iterator_detail
|
|
} // namespace sprout
|
|
|
|
namespace sprout_iterator_detail {
|
|
template<typename BidirectionalIterator>
|
|
inline SPROUT_CONSTEXPR BidirectionalIterator
|
|
prev(BidirectionalIterator const& it) {
|
|
using sprout::iterator_detail::iterator_prev;
|
|
using sprout_adl::iterator_prev;
|
|
return iterator_prev(it);
|
|
}
|
|
template<typename BidirectionalIterator>
|
|
inline SPROUT_CONSTEXPR BidirectionalIterator
|
|
prev(BidirectionalIterator const& it, typename std::iterator_traits<BidirectionalIterator>::difference_type n) {
|
|
using sprout::iterator_detail::iterator_prev;
|
|
using sprout_adl::iterator_prev;
|
|
return iterator_prev(it, n);
|
|
}
|
|
} // namespace sprout_iterator_detail
|
|
|
|
namespace sprout {
|
|
//
|
|
// prev
|
|
//
|
|
template<typename BidirectionalIterator>
|
|
inline SPROUT_CONSTEXPR BidirectionalIterator
|
|
prev(BidirectionalIterator const& it) {
|
|
return sprout_iterator_detail::prev(it);
|
|
}
|
|
template<typename BidirectionalIterator>
|
|
inline SPROUT_CONSTEXPR BidirectionalIterator
|
|
prev(BidirectionalIterator const& it, typename std::iterator_traits<BidirectionalIterator>::difference_type n) {
|
|
return sprout_iterator_detail::prev(it, n);
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_ITERATOR_PREV_HPP
|